Roof loads are a downward vertical force on the home.
Wind load lb square foot on roof.
The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.
An alternative to calculating wind pressure at a particular wind speed is to use the standard for various wind zones.
In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.
This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow.
All loads are listed as pounds per square foot of horizontal projection footprint area.
If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure.
The result snow load or the pressure exerted by the snow has the units of kn m or lbs ft.
This load can be measured in miles per hour english speed or velocity or pounds per square foot english pressure based on the corresponding radio button selected.
Negative wind load 93 75 52 73 33 75 23 44 17 22 13 18 10 42.
Load type span in feet 1 span 2 span 1 span 2 span 3 span 4 span 4 span load type allowable uniform loads in pounds per square foot span in feet 1 span 2 span 3 span the engineering data contained herein is for the expressed use of customers and design professionals.
The unit for wind pressure is pounds per square foot psf.
This edit box is used to define the wind load for the building or shape.
The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot.
This is all of the natural stresses imposed upon a roof such as snow loads rain loads and wind loads.
Here each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load 65 psf total to the structural support system.
Snow load thickness density.
Determine the transient load of the roof.
To figure out the load on your roof take the depth of snow in feet and multiply it by the weight of a cubic foot of snow.
Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.
The load increases with the use of heavier roofing material.
If you want to calculate these values by hand use the following formulas.
For example if the wind speed is 70 mph the wind pressure is 0 00256 x 70 2 12 5 psf.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
A clay tiled roof may have a dead.
